// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/sys_info.h"

#include <ApplicationServices/ApplicationServices.h>
#include <CoreServices/CoreServices.h>
#include <mach/mach_host.h>
#include <mach/mach_init.h>
#include <sys/sysctl.h>
#include <sys/types.h>

#include "base/logging.h"
#include "base/mac/scoped_mach_port.h"
#include "base/strings/stringprintf.h"

namespace base {

// static
std::string SysInfo::OperatingSystemName()
{
    return "Mac OS X";
}

// static
std::string SysInfo::OperatingSystemVersion()
{
    int32 major, minor, bugfix;
    OperatingSystemVersionNumbers(&major, &minor, &bugfix);
    return base::StringPrintf("%d.%d.%d", major, minor, bugfix);
}

// static
void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
    int32* minor_version,
    int32* bugfix_version)
{
    Gestalt(gestaltSystemVersionMajor,
        reinterpret_cast<SInt32*>(major_version));
    Gestalt(gestaltSystemVersionMinor,
        reinterpret_cast<SInt32*>(minor_version));
    Gestalt(gestaltSystemVersionBugFix,
        reinterpret_cast<SInt32*>(bugfix_version));
}

// static
int64 SysInfo::AmountOfPhysicalMemory()
{
    struct host_basic_info hostinfo;
    mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
    base::mac::ScopedMachSendRight host(mach_host_self());
    int result = host_info(host.get(),
        HOST_BASIC_INFO,
        reinterpret_cast<host_info_t>(&hostinfo),
        &count);
    if (result != KERN_SUCCESS) {
        NOTREACHED();
        return 0;
    }
    DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
    return static_cast<int64>(hostinfo.max_mem);
}

// static
int64 SysInfo::AmountOfAvailablePhysicalMemory()
{
    base::mac::ScopedMachSendRight host(mach_host_self());
    vm_statistics_data_t vm_info;
    mach_msg_type_number_t count = HOST_VM_INFO_COUNT;

    if (host_statistics(host.get(),
            HOST_VM_INFO,
            reinterpret_cast<host_info_t>(&vm_info),
            &count)
        != KERN_SUCCESS) {
        NOTREACHED();
        return 0;
    }

    return static_cast<int64>(
               vm_info.free_count - vm_info.speculative_count)
        * PAGE_SIZE;
}

// static
std::string SysInfo::CPUModelName()
{
    char name[256];
    size_t len = arraysize(name);
    if (sysctlbyname("machdep.cpu.brand_string", &name, &len, NULL, 0) == 0)
        return name;
    return std::string();
}

std::string SysInfo::HardwareModelName()
{
    char model[256];
    size_t len = sizeof(model);
    if (sysctlbyname("hw.model", model, &len, NULL, 0) == 0)
        return std::string(model, 0, len);
    return std::string();
}

} // namespace base
